Even though I perceive an isolated palmar whorl to have no specific meaning at all, in my Extraversion-Introversion research project I have found that whorls in the ulnar side of the palm are relatively common in 'extraverts' (present in 4 out of the studied 28 extraverts, which concerns an unusually high percentage for a palmar whorl... and none of the studied 21 introverts had it); more details are available inside the article: